ADHD, or Attention Deficit Hyperactivity Disorder, is a neurodevelopmental disorder that affects both children and adults. It is characterized by signs such as difficulty with focus, hyperactivity, and impulsivity.
ADHD can make it hard to complete tasks, follow through on responsibilities, and connect with others.
Everyone struggles with attention or impulse control sometimes. For someone with ADHD, though, these difficulties can be relentless.
ADHD is often diagnosed in childhood but can also be diagnosed later in life. It is common for many people to recognize they have ADHD later in life or go their whole lives without a formal diagnosis.
While the signs of ADHD can change with time, they can still interfere with an individual’s functioning, specifically in their relationships, health, work, and finances.
The first known documentation of ADHD was from 1902, when it was coined for some children. Since then, the condition has been given numerous names, one of these being attention deficit disorder (ADD) which is now an outdated term.
Signs of ADHD
Experiencing some signs of ADHD does not automatically mean someone has the disorder. Many of these signs are common and relatable on their own.
Additionally, individuals with ADHD may not exhibit all signs or traits and may have varying levels of each trait depending on the situation.
Inattention & Focus Issues 🧠
- Easily distracted, such as ‘zoning out’ during conversations or switching focus during tasks.
- May miss important information because they have ‘zoned out’.
- Often forgetful, for example, they may forget birthdays, instructions, or homework.
- Hyper-focusing on tasks that interest them, to the detriment of basic needs like eating and sleeping.
- Executive dysfunction, which is difficulty executing and completing tasks from start to finish.
Hyperactivity & Impulsivity ⚡️
- Hyperactivity, such as not being able to sit still or having racing thoughts.
- Impulsivity, which can manifest as reckless spending or interrupting others.
- Have a low tolerance for boredom and need a lot of stimulation.
Emotional & Functional Challenges 😟
- Time management difficulties, like getting to appointments on time and procrastinating on important tasks.
- Difficulties regulating emotions, such as managing strong emotions which can sometimes result in outbursts.
- Motivational issues.
- Low self-esteem after years of not meeting their and other people’s expectations.
- Trouble with sleep, including getting to sleep, staying asleep, and waking up on time.
How is ADHD diagnosed?
Below is some information on the diagnosis process. Please note that this article is for informational purposes only and should not be used as a diagnostic tool for ADHD.
What kind of doctor diagnoses ADHD?
ADHD can be diagnosed by a variety of medical and mental health professionals, including psychiatrists, pediatricians, psychologists, and, in some cases, primary care providers.
Psychiatrists and other specialists are particularly helpful in making a diagnosis and managing treatment, especially if co-occurring conditions are present.
It is important to find a professional with experience in diagnosing and treating ADHD.
What tests or assessments are used to diagnose ADHD?
The diagnosis is based on a comprehensive assessment that includes:
- Symptom Checklists and Rating Scales: Professionals use standardized criteria, such as those from the DSM-5 (Diagnostic and Statistical Manual of Mental Disorders), to determine if a person meets the required number of symptoms for inattention and/or hyperactivity-impulsivity (fidgeting, restlessness, or difficulty staying seated or quiet).
- Information Gathering: The clinician will conduct interviews with the person and, if possible, with family members, friends, or teachers to get a detailed history of symptoms and how they affect daily life.
- Medical Exam: A medical exam may be performed to rule out other conditions that could be causing similar symptoms, such as thyroid problems, anxiety, depression, or learning disabilities.
- Childhood History: Since ADHD is a neurodevelopmental disorder, symptoms must have been present in childhood, typically before age 12. For adults, this means the clinician will gather information about their childhood behavior from them and others who knew them well.
DSM-5-TR and ICD-11 Criteria
Clinicians in the US mainly use the American Psychiatric Association’s DSM-5-TR. The rest of the world mostly uses the World Health Organization’s ICD-11, and the two are closely aligned.
Both systems require symptoms from two domains: inattention, and hyperactivity-impulsivity. Several symptoms must appear before age 12, and show up in two or more settings, such as home, school, or work. They must not be explained by another condition.
DSM-5-TR also records how severe the presentation is (mild, moderate, or severe) and, unlike its predecessor, allows a co-occurring diagnosis of autism spectrum disorder. ICD-11 places ADHD among the neurodevelopmental disorders too, replacing the older, narrower category of “hyperkinetic disorders.”
Can I get diagnosed with ADHD as an adult?
Yes, adults can be diagnosed with ADHD.
The diagnostic process for adults is similar to that for children. It requires a thorough review of past and present symptoms. This confirms they began in childhood and are not better explained by another condition.
Adults need fewer symptoms than children. This also covers adolescents aged 17 and older. Both need five symptoms of inattention or hyperactivity-impulsivity, rather than six.
Many people are not diagnosed until adulthood. Often, it’s low awareness, or another condition masking their symptoms. Adult ADHD is still widely underdiagnosed and undertreated across Europe (Kooij et al., 2019).
One reason: overt hyperactivity fades with age. Inattention and emotional ups and downs tend to persist instead. As a result, adult ADHD often looks nothing like the hyperactive child of the textbooks (Franke et al., 2018).
ADHD types
The DSM-5 criteria for ADHD list three types of ADHD:
- Predominantly inattentive type
- Predominantly hyperactive-impulsive type
- Combined hyperactive-impulsive and inattentive type.
Below are the types and some of the traits associated with each one:
Predominately inattentive type
The predominantly inattentive type of ADHD is characterized by difficulties in maintaining focus, following instructions, and organizing tasks, often resulting in forgetfulness and distractibility. Because these children tend to be quiet rather than disruptive, this type is the most easily overlooked, especially in girls and women.
Predominantly hyperactive-impulsive type
The predominantly hyperactive-impulsive type of ADHD is characterized by excessive activity, restlessness, impulsivity, and difficulty waiting or taking turns, often leading to disruptive behavior. This presentation is the most visible, and it is more common in younger children, which is why it most often prompts early referral.
Combined hyperactive-impulsive and inattentive type
The combined hyperactive-impulsive and inattentive type of ADHD is characterized by a significant presence of both inattentive and hyperactive-impulsive symptoms, leading to challenges in multiple areas of functioning. It is the most frequently diagnosed presentation in clinically referred children, and typically carries the broadest functional impairment.
ADHD In Girls And Women
ADHD is diagnosed about three times more often in males than females. That gap reflects under-detection, not a true difference in how common ADHD is: many girls with ADHD go unidentified and untreated, risking long-term social, educational, and mental health consequences.
A 2020 consensus summarized key points for the detection of ADHD in females:
- Females present with both inattentive and hyperactive-impulsive signs, although hyperactive-impulsive signs may be less severe or noticeable than in males.
- Emotional issues, such as low mood, emotional lability, anxiety, and emotional regulation problems, may be more common or severe in females with ADHD.
- Girls with ADHD are vulnerable to bullying, increased school drop-out, academic underachievement, and decreased self-esteem and self-concept.
- They may not show as many behavioral problems commonly associated with males, and compensatory behaviors may mask behaviors and difficulties.
- Dysfunctional coping strategies, such as alcohol or drug use, may be used to deal with emotional problems, social isolation, and rejection.
Girls and women with ADHD may become skilled at camouflaging their struggles using compensatory strategies, leading to an underestimation of their underlying problems.
Consequently, females with ADHD are often treated for anxiety or depression before receiving an ADHD diagnosis.
It is crucial not to discount ADHD in females simply because they may not display the stereotypical idea of an ADHD boy who “bounces off the walls.”
What Causes ADHD?
The cause of ADHD likely cannot be tied to a single factor but is likely due to a complex combination of multiple factors that alter brain chemistry and structure:
Genetics
There is no single cause of ADHD, but the evidence for a strong genetic origin is unusually solid.
This means that if someone has ADHD, there is a good chance that they have a family member who also has ADHD.
Twin and family studies put ADHD’s heritability at about 74%, among the highest in psychiatry (Faraone & Larsson, 2019). No single “ADHD gene” exists.
About a third of that heritability comes from many common variants, each with a tiny effect, plus a further share from rarer variants. High heritability does not mean genes are destiny.
It means genetic differences explain most of the variation between people at a population level, leaving real room for environment to shape how ADHD is expressed.
Large genome-wide studies have since found dozens of specific gene regions involved, many concentrated in early brain development and in dopamine-producing neurons (Demontis et al., 2019, 2023).
Brain differences
Research suggests that ADHD brains show measurable structural differences from brains without the condition.
One brain-scan study of adolescents with ADHD found smaller grey matter volumes than in typically developing peers (Bonath et al., 2018). The differences showed up in the anterior cingulate cortex, occipital cortex, cerebellar regions, and bilateral hippocampus/amygdala. The anterior cingulate cortex finding mattered most.
Reduced grey matter there correlated with how inattentive participants scored, tying the difference to ADHD’s attentional problems. Grey matter supports learning, memory, and attention.
Whether ADHD causes these differences, results from them, or reflects a slower brain-maturation timetable is still debated. The study was also cross-sectional, so it shows an association, not a cause, and it cannot diagnose any one person.
Environmental factors
There are believed to be some factors in the environment that may increase the likelihood of someone having ADHD:
- Exposure to lead or pesticides in early childhood
- Premature birth or low weight at birth
- Brain injury
It has been believed in the past that certain environmental factors may cause ADHD, although these have not been found to be the case.
Some factors do not cause ADHD at all: watching lots of TV, eating sugar, family stress, parenting style, and traumatic experiences.
Family stress will not cause ADHD on its own. It can, however, change how ADHD shows up day to day, and raise the risk of problems such as anti-social behavior.
Researchers are continuing to study the exact relationship between ADHD and environmental factors but point out that there is no single cause that can account for all cases of ADHD.
Dopamine levels
Brain chemistry differences are a likely cause of ADHD, and dopamine is one of the most studied.
Dopamine is a brain chemical central to motivation, reward, and reinforcement, not mainly emotional regulation.
People with ADHD may have different dopamine availability compared to people without ADHD.
The clearest evidence comes from a brain-imaging study of 53 non-medicated adults with ADHD and 44 controls. It found lower availability of dopamine transporters and receptors in the brain’s reward pathway, and lower availability tracked with worse inattention (Volkow et al., 2009).
An earlier study had actually found the opposite: a 70% increase in the same dopamine transporters (Dougherty et al., 1999). The contradiction is informative, not a dead end.
Differences in imaging method, brain region, and prior medication use all shift these readings.
Most researchers no longer frame ADHD as simply “too much” or “too little” dopamine. Instead, they describe atypical regulation of dopamine signaling in reward circuits, a picture that fits low motivation and a pull toward immediate over delayed rewards.
Co-existing conditions
More than two-thirds of people who have ADHD also have at least one other co-existing condition.
Occasionally, ADHD may overshadow other conditions, making it harder to notice.
Likewise, the other condition may overshadow ADHD, meaning that ADHD can go undiagnosed in some.
Mood disorders
Studies suggest that up to 53.3% of adults with ADHD may also have depression. The overlap is real.
About 14% of children with ADHD have depression, compared with 1% of children without it. Up to 20% of those with ADHD may also show signs of bipolar disorder.
Usually, the ADHD signs come first. The mood disorder tends to follow, perhaps a result of the daily struggles ADHD brings.
Anxiety
It is common for people with ADHD to also have a co-existing anxiety disorder. This can include generalized anxiety disorder, social anxiety, or OCD.
ADHD makes daily tasks and relationships harder to manage. That can raise anxious feelings on top of the anxiety disorder itself.
Anxiety disorders are simply more common with ADHD. That likely reflects shared brain and life-stress factors, not one causing the other.
Autism
Autism is characterized by differences in social communication, social interaction, and behavior, with a wide range of characteristics such as sensory differences, restricted interests, and repetitive behaviors.
Autism and ADHD are believed to commonly co-occur. It is unclear precisely how common it is, but scientific literature suggests 50-70% of autistic individuals may have co-occurring ADHD.
Until 2013, the diagnostic manual did not allow both diagnoses in the same person. The DSM-5 changed this, explicitly permitting ADHD and autism to be diagnosed together.
Tic and Tourette syndrome
It is common for those with Tourette syndrome to have coexisting ADHD.
Tics include sudden, rapid, involuntary movements or vocalizations. Tourette syndrome is rarer but most severe, involving making involuntary noises or movements on an almost daily basis for years.
These extra challenges can make it harder for a child to manage at school and can worsen feelings of anxiety and depression.
Can ADHD be managed?
ADHD is a lifelong condition that can be effectively managed through various approaches, including medication, therapy, and self-help strategies.
While there is no single solution, a combination of methods often works best to help individuals navigate daily life.
Always consult a healthcare professional for personalized guidance.
Strengths Alongside The Challenges
ADHD is not only a list of difficulties. In a study of successful adults with ADHD, researchers at King’s College London interviewed participants. They found recurring strengths.
As Sedgwick and colleagues found, these included resilience, high energy, courage, and self-acceptance, alongside traits like divergent thinking and intense hyper-focus on absorbing tasks (Sedgwick et al., 2019). Participants described actively using these traits to work with their ADHD rather than only against it.
These are just a few people’s accounts, not everyone’s experience. Still, they matter: care that builds on strengths, not just one that treats impairment, is part of what people with ADHD say helps most.
Medication
Medications for ADHD are primarily divided into two types: stimulants and non-stimulants.
- Stimulant medications, such as Ritalin, Adderall, and Vyvanse, can help improve focus by increasing dopamine levels in the brain. They can, however, have side effects, including sleep or heart problems.
- Non-stimulant medications, like Wellbutrin and Strattera, are less commonly prescribed and may be used for those with co-occurring severe anxiety. They work by increasing the levels of certain neurotransmitters in the brain.
The strongest evidence on which medication works best comes from a network meta-analysis of 133 clinical trials covering more than 18,000 children, adolescents, and adults (Cortese et al., 2018).
The results were clear. It found methylphenidate the best first choice for children and adolescents, and amphetamines the best first choice for adults.
That evidence is strong, but it mostly covers the first 12 weeks of treatment. Longer-term evidence is still thin, so decisions about staying on medication for years weigh clear short-term benefit against less certain long-term evidence.
Therapy
- Behavioral therapy helps individuals learn skills to manage their ADHD symptoms. The goal is to develop more effective strategies to address areas like organization, focus, and impulse control. This can make it easier to navigate school, work, and relationships.
- Cognitive Behavioral Therapy (CBT) is another effective option. It helps individuals recognize how their thoughts influence their behaviors, allowing them to reframe thought patterns and better manage their symptoms. CBT can also assist with co-occurring conditions, such as mood and anxiety disorders.
ADHD Coaching
ADHD coaching is another valuable tool that helps individuals manage their daily lives.
A coach works with you to build on your strengths and develop new skills to better handle challenges with time management, organization, and goal-setting.
It provides a structured, supportive partnership focused on practical strategies for navigating your specific needs.
The Value of a Support Network
Connecting with others who have ADHD or who are neurodivergent can be a powerful way to manage the condition.
Building a support network, whether through online communities or local groups, can provide a sense of belonging and help you feel more comfortable with who you are.
Sharing tips, experiences, and struggles with others who understand can reduce feelings of isolation and improve self-esteem.
Language and Neurodiversity
Many people with ADHD find it more helpful to see it as a form of natural brain variation, not only something to treat. The clinical language used earlier in this article, terms like “impairment” and “symptoms”, reflects the medical model, which still matters for accessing services and support.
ADHD terminology is less settled than autism’s. Surveyed neurodivergent adults rated “person with ADHD” and “ADHDer” about equally, with no strong identity-first preference either way. Softer alternatives, like “attention differences”, were rated just as poorly as blunt clinical terms (Pearson et al., 2026). Precise, direct language beats euphemism.
Self-Help Strategies
In addition to formal treatment, many individuals use self-help methods to cope with ADHD symptoms.
These practical strategies can help with personal struggles, such as managing your daily life and relationships:
- Structure and Routine: Creating a consistent daily schedule with regular expectations, making lists, and using a calendar can help reduce forgetfulness and manage time.
- Task Management: Breaking large tasks into smaller, more manageable parts can help prevent feeling overwhelmed. Taking regular breaks is also helpful for maintaining focus and letting out energy.
- Lifestyle Adjustments: Engaging in regular exercise can help stimulate the brain, improve focus, and reduce impulsivity. Regulating sleep patterns by reducing sugar, caffeine, and screen time can also help manage symptoms.
- Mindfulness: Practicing breathing exercises, yoga, meditation, or spending time outdoors can help calm an overactive mind and ease symptoms.
If you are someone who has ADHD, you might find that you structure your life in a way that might be less conventional but works for your brain. Even small accommodations at home or the workplace can make a huge difference to your quality of life.
Further Reading
References
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